I don't mean to be rude but photomatix is hands down the easiest way to kill any image quality from any camera
softness and noise? it introduces it in spades. (I have used photomatix alot and I cant stand the output anymore the tone mapping is just plain horrible)
If you are a fan of HDR and want to retain all of that lovely sharp raw IQ look at this method, still shoot the bracket sets but its more a manual form of controlling the tonal ranges rather than the wholesale slaughter that comes out of the cookie cutter softwarehttp://goodlight.us/writing/tutorials.html
but as for photomatix goes if you put D800 or 5Dmk3 files through it either will be ruined so which camera and lens is sharper becomes a moot point.